(ITS#3483) test006 fails for back-ldbm

Full_Name: Pierangelo Masarati
Version: HEAD
OS: irrelevant
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (81.72.89.40)
Submitted by: ando
After implementing the ACL_DISCLOSE (ITS#3472) in back-bdb/hdb and updating the
test accordingly, back-ldbm fails. If the implementation in back-bdb sounds
fine, I'm planning to port it to all backends shortly. If this change is to be
considered experimental for some time, I can wrap it in #define LDAP_DEVEL and
revert the changes to the test.